ULPT request: Tiny Rental Home in backyard

Hi all! I really need to make some extra income. Recently became the only provider for my household. I’m blessed to have a house with a backyard and had the idea to build a tiny home back there and rent it out to make ends meet or at least just pay for utilities. But, i live in Irving Texas and it seems like it’s a huge and expensive process just to get approved by the city to build a new dwelling in your own backyard.

So I was wondering, is there anyway I can build and make a livable space without needing the cities approval? I even considered adding a outhouse to avoid needing to set up a septic. But then I’m not sure about electricity or water. Any advice is much appreciated!! 🙏🏻